Borehole cleaning device and borehole cleaning method

Abstract

To provide an inside hole cleaning device which can clean the inside of a hole efficiently and surely.SOLUTION: An inside hole cleaning device 1A for cleaning in a bottomed hole 3 includes: a cylindrical suction part 10A which can be inserted in the hole 3; and a suction hose 20 communicating with the inside of the suction part 10A. At a base end part of the suction part 10A, a tip part of the suction hose 20 is connected. The suction hose 20 can be connected to the suction device. The maximum internal diameter of the suction part 10A is larger than the internal diameter of a tip part of the suction hose 20.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a hole cleaning device and a hole cleaning method for cleaning the inside of a bottomed hole formed in a structure.

Background Art

[0002] As a method for reinforcing the shear strength of an existing concrete structure during post-construction, there is a method in which a hole is formed in the concrete structure, mortar is filled into the hole, and before the mortar hardens, a reinforcing bar is inserted into the hole to embed the reinforcing bar in the concrete structure (see, for example, Patent Document 1). In the above-described reinforcing method, before filling the hole with mortar, water is sprayed into the hole through a water spray hose inserted into the hole to moisten the inner surface of the hole. Then, a suction hose is inserted into the hole, and after sucking the drilled chips and water in the hole with the suction hose, the hole is filled with mortar.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] FIG. 5 is a side view showing a conventional suction hose. As shown in FIG. 5, a cylindrical brush 130 is externally fitted to a conventional suction hose 120 used for cleaning the inside of the hole described above. When the suction hose 120 is inserted into the hole 3, the brush 130 pushes the drilled chips and water toward the bottom 3a side of the hole 3. In this configuration, since the tip of the suction hose 120 protrudes beyond the brush 130, there is a problem that the drilled chips and water accumulated between the tip port 121 of the suction hose 120 and the brush 130 remain in the hole 3 without being sucked from the tip port 121 of the suction hose 12o. The present invention aims to solve the aforementioned problems and provide a hole cleaning device and hole cleaning method that can efficiently and reliably clean the inside of a hole. [Means for solving the problem]

[0005] To solve the aforementioned problems, the first invention is: Drilled into the concrete structure to insert reinforcing bars A hole cleaning device for cleaning the inside of a bottomed hole, comprising a cylindrical suction part that can be inserted into the hole, and a suction hose communicating with the inside of the suction part, A sliding contact member fitted onto the suction hose and insertable into the hole, It is equipped with the following: The tip of the suction hose is connected to the base end of the suction section, and the suction hose is connectable to a suction device. The maximum inner diameter of the suction section is larger than the inner diameter of the tip of the suction hose. It is formed in such a way. The sliding contact member is made of an elastic body that shrinks in diameter when it is pushed into the hole and comes into sliding contact with the inner circumferential surface of the hole. In the borehole cleaning device of the present invention, the suction section, which has a larger diameter than the tip of the suction hose, can efficiently and reliably suck up drilling debris and water from inside the borehole. Furthermore, in the aforementioned hole cleaning device, if the inner diameter of the suction section is reduced from the tip end to the base end, drilling debris and water can be smoothly sucked from the suction section into the suction hose. Furthermore, in the aforementioned hole cleaning device, if an inclined surface that decreases in diameter towards the tip is formed on the outer surface of the suction part, the suction part can be smoothly inserted into the hole.

[0006] In the hole cleaning device described above, the maximum outer diameter of the suction portion may be formed to be greater than or equal to the inner diameter of the hole to be cleaned, and the suction portion may be formed of an elastic body that shrinks in diameter when pushed into the hole. In this configuration, as the suction unit and suction hose are inserted into the hole while suction is being applied, a negative pressure is created in the space beyond the suction unit, causing the suction unit to be drawn towards the bottom of the hole, thus making it easier to insert the hole cleaning device into the hole.

[0007] This invention Hole cleaning device So,As the suction unit, suction hose, and sliding contact member are inserted into the hole while suction is being applied, a negative pressure is created in the space beyond the sliding contact member, causing the sliding contact member to be drawn towards the bottom of the hole, thus making it easier to insert the hole cleaning device into the hole. Furthermore, when a sliding contact member is fitted onto the suction hose, it is preferable to make the maximum outer diameter of the suction portion smaller than the inner diameter of the hole to facilitate insertion of the suction portion into the hole. Furthermore, in the aforementioned hole cleaning device, if the outer diameter of the sliding contact member decreases from the middle to the tip and base ends, the sliding contact member can be smoothly inserted into and withdrawn from the hole.

[0008] To solve the aforementioned problems, the second invention is a method for cleaning a hole into which a reinforcing member for reinforcing an existing concrete structure is inserted, using the hole cleaning device, comprising the steps of: inserting the hole cleaning device into the hole from the suction unit side; inserting the hole cleaning device toward the bottom of the hole while suctioning the inside of the hole through the suction unit and the suction hose; and stopping the suction inside the hole and withdrawing the hole cleaning device from the hole. In the hole cleaning method of the present invention, drilling debris and water inside the hole can be efficiently and reliably sucked up by the hole cleaning device before inserting a reinforcing member into the hole, thereby improving the efficiency of reinforcement work by post-construction on existing concrete structures. [Effects of the Invention]

[0009] In the borehole cleaning device and borehole cleaning method of the present invention, the suction section, which has a larger diameter than the tip of the suction hose, can efficiently and reliably suck up drilling debris and water from inside the borehole, thereby improving the work efficiency when cleaning the inside of the borehole. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing a hole cleaning device according to an embodiment of the present invention. [Figure 2] This is a side view showing a hole cleaning device according to an embodiment of the present invention. [Figure 3] It is a side view showing a method for cleaning inside a hole according to an embodiment of the present invention. [Figure 4] It is a side view showing a hole cleaning device according to another embodiment of the present invention. [Figure 5] It is a side view showing a conventional hole cleaning device.

Embodiments for Carrying Out the Invention

[0011] Embodiments of the present invention will be described in detail with appropriate reference to the drawings. In this embodiment, a hole cleaning device and a hole cleaning method used in a reinforcement method for an existing concrete structure will be described. When reinforcing an existing concrete structure in post-construction, first, the concrete structure is drilled with a drill to form a bottomed hole in the concrete structure. Subsequently, a watering hose is inserted into the hole, and water is sprayed into the hole by the watering hose to moisten the inner surface of the hole. Then, a suction hose is inserted into the hole, and the drilled chips and water in the hole are sucked by the suction hose to clean the inside of the hole. Further, mortar is filled into the hole, and before the mortar hardens, a reinforcing bar is inserted into the hole. By embedding the reinforcing bar in the concrete structure in this way, the shear strength of the concrete structure is reinforced in post-construction.

[0012] [[ID=Element ID=23]]Figure 2 is a side view showing a hole cleaning device according to an embodiment of the present invention. As shown in Figure 2, the hole cleaning device 1A in this embodiment is a device for sucking and cleaning the drilled chips and water in the hole 3 before filling mortar into the hole 3 formed in the concrete structure 2 in the reinforcement method of the existing concrete structure 2. The hole cleaning device 1A includes a cylindrical suction part 10A that can be inserted into the hole 3, a suction hose 20 that communicates with the inside of the suction part 10A, and a sliding contact member 30 that is externally fitted to the suction hose 20. The suction hose 20 is a long, cylindrical, flexible hose made of resin. The base end of the suction hose 20 is connected to the intake port of the suction device 50.

[0013] FIG. 1 is a perspective view showing a hole cleaning device according to an embodiment of the present invention. As shown in FIG. 1, the suction part 10A is a member made of resin such as polyethylene. The suction part 10A is formed in a substantially cylindrical shape, and the tip cylinder part 11 and the base cylinder part 12 are continuously formed. The outer diameter and inner diameter of the tip cylinder part 11 are formed to have a constant size. The outer diameter and inner diameter of the base cylinder part 12 are reduced in diameter from the tip side toward the base side. That is, the inner peripheral surface and outer peripheral surface of the tip cylinder part 11 present a cylindrical surface, and the inner peripheral surface and outer peripheral surface of the base cylinder part 12 present a conical frustum surface (tapered surface). The tip part of the suction hose 20 is connected to the base end part of the base cylinder part 12 of the suction part 10A. The tip opening of the suction hose 20 communicates with the opening of the base end part of the base cylinder part 12. Thereby, the suction hose 20 communicates with the inside of the suction part 10A. [[ID=�]]The maximum inner diameter of the suction part 10A (the inner diameter of the tip cylinder part 11 and the inner diameter of the tip side of the base cylinder part 12) is formed larger than the inner diameter of the tip opening of the suction hose 20. The maximum outer diameter of the suction part 10A (the outer diameter of the tip cylinder part 11 and the outer diameter of the tip side of the base cylinder part 12) is formed smaller than the inner diameter of the hole 3. For example, when the inner diameter of the hole 3 is about 60 mm, the maximum outer diameter of the suction part 10A is formed about 2 - 8 mm smaller than the inner diameter of the hole 3. In addition, it is preferable that the maximum outer diameter of the suction part 10A is 80 - 95% of the inner diameter of the hole 3.

[0014] The sliding contact member 30 is an elastic body such as urethane externally fitted to the suction hose 20. The sliding contact member 30 is arranged at an interval with respect to the suction part 10A. The sliding contact member 30 is formed in a shape in which conical frustums are connected before and after a cylinder, and the outer diameter of the sliding contact member 30 is reduced in diameter from the middle part toward the tip side and the base side. A through hole into which the suction hose 20 can be inserted is formed in the sliding contact member 30. As shown in Figure 2, the maximum outer diameter of the sliding contact member 30 (the outer diameter of the middle portion of the sliding contact member 30) is formed to be greater than or equal to the inner diameter of the hole 3. For example, if the inner diameter of the hole 3 is about 60 mm, the maximum outer diameter of the sliding contact member 30 is formed to be about 8 to 15 mm larger than the inner diameter of the hole 3. Preferably, the maximum outer diameter of the sliding contact member 30 is 100 to 130% of the inner diameter of the hole 3. The sliding contact member 30 has elasticity that causes it to shrink in diameter when pushed into the hole 3. This allows the sliding contact member 30 to be inserted into the hole 3. When the sliding contact member 30 is inserted into the hole 3, the outer surface of the sliding contact member 30 slides against the inner surface of the hole 3. At this time, the space on the bottom 3a side of the hole 3 is sealed by the sliding contact member 30.

[0015] Next, a method for cleaning the inside of hole 3 using the hole cleaning device 1A of this embodiment will be described. Figure 3 is a side view showing a hole cleaning method according to an embodiment of the present invention. First, as shown in Figure 3, the hole cleaning device 1A is inserted into the opening of the hole 3 formed in the concrete structure 2 from the suction section 10A side. In this case, the maximum outer diameter of the suction part 10A is smaller than the inner diameter of the hole 3, making it easy to insert the suction part 10A into the hole 3. Also, since the outer diameter of the sliding contact member 30 decreases from the middle to the tip, the sliding contact member 30 can be smoothly inserted into the hole 3. When the sliding contact member 30 is inserted into the hole 3, the space on the bottom 3a side of the hole 3 becomes sealed.

[0016] After the sliding contact member 30 is placed inside the hole 3, the suction device 50 (see Figure 2) sucks the air inside the suction hose 20. This allows drilling debris and water from the hole 3 to be sucked out through the suction unit 10A and the suction hose 20. The inner diameter of the base end cylindrical portion 12 of the suction unit 10A decreases towards the base end side (suction hose 20 side), so drilling debris and water can be smoothly sucked from the suction unit 10A into the suction hose 20. Furthermore, when air is drawn into the hole 3 through the suction unit 10A and the suction hose 20, the space beyond the sliding contact member 30 (towards the bottom 3a) becomes negatively pressurized. As a result, the sliding contact member 30 is attracted towards the bottom 3a of the hole 3, making it easier to insert the suction unit 10A to the bottom 3a of the hole 3, even if the depth of the hole 3 is several meters or more.

[0017] When the suction unit 10A reaches the bottom 3a of the hole 3, the hole cleaning device 1A is withdrawn from the hole 3 to complete the cleaning of the inside of the hole 3. At this time, the suction by the suction device 50 (see Figure 2) may be stopped before withdrawing the hole cleaning device 1A from the hole 3, or the suction by the suction device 50 (see Figure 2) may be continued while withdrawing the hole cleaning device 1A from the hole 3. Furthermore, the outer diameter of the base end cylindrical portion 12 of the suction portion 10A decreases towards the base end, and the outer diameter of the sliding contact member 30 decreases from the middle portion towards the base end, so that the suction portion 10A and the sliding contact member 30 can be smoothly withdrawn from the hole 3.

[0018] As shown in Figure 3, the borehole cleaning device 1A and borehole cleaning method described above can efficiently and reliably remove drilling debris and water from the borehole 3 for inserting the reinforcing member, thereby improving the efficiency of post-construction reinforcement work on the existing concrete structure 2.

[0019] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from its spirit. For example, the shape and material of the suction section 10A shown in Figure 1 are not limited; it is sufficient that the maximum inner diameter of the suction section 10A is larger than the inner diameter of the tip of the suction hose 20. Furthermore, the shape and material of the sliding contact member 30 are not limited; for example, the outer diameters of the tip, middle, and base of the sliding contact member 30 may be the same. In the bore cleaning device 1A of this embodiment, the sliding contact member 30 is fitted onto the suction hose 20, Reference examples of the present invention include: It is not necessary to provide the sliding contact member 30.

[0020] In the hole cleaning device 1A of this embodiment, the maximum outer diameter of the suction section 10A is formed to be smaller than the inner diameter of the hole 3. However, as shown in the hole cleaning device 1B in Figure 4, the suction section 10B may be formed from an elastic material, and the maximum outer diameter of the suction section 10B may be formed to be greater than or equal to the inner diameter of the hole 3. In this configuration, when the suction part 10B is pushed into the hole 3, the diameter of the suction part 10B decreases, making it possible to insert the suction part 10B into the hole 3. Then, when suction is applied to the inside of the hole 3 through the suction part 10B and the suction hose 20, the space beyond the suction part 10B becomes negatively pressurized. As a result, the suction part 10B is attracted towards the bottom 3a of the hole 3, making it easier to insert the suction part 10B all the way to the bottom 3a of the hole 3. Furthermore, in the hole cleaning device 1B shown in Figure 4, an inclined surface 13 that narrows in diameter towards the tip is formed on the outer surface of the suction part 10B, allowing the suction part 10B to be smoothly inserted into the hole 3. [Explanation of symbols]

[0021] 1A Hole cleaning device 1B Hole cleaning device (other embodiment) 2. Concrete structures 3 holes 3a bottom 10A suction part 10B Suction section (other embodiments) 11 Tip tube part 12 Proximal cylinder part 13 Slope 20 Suction hoses 30 Sliding contact member 50 Suction device

Claims

1. A hole cleaning device for cleaning the inside of a bottomed hole drilled in a concrete structure for inserting reinforcing bars, A cylindrical suction part that can be inserted into the aforementioned hole, A suction hose that is in communication with the suction section, The suction hose is fitted to the outside of the sliding contact member which can be inserted into the hole, The tip of the suction hose is connected to the base end of the suction unit. The aforementioned suction hose is connectable to a suction device. The maximum inner diameter of the suction section is formed to be larger than the inner diameter of the tip of the suction hose. The hole cleaning device is characterized in that the sliding contact member is made of an elastic body that shrinks in diameter when it is pushed into the hole and comes into sliding contact with the inner circumferential surface of the hole.

2. The hole cleaning device according to claim 1, characterized in that the inner diameter of the suction portion decreases from the tip side to the base side.

3. The hole cleaning device according to claim 1, characterized in that the tip of the outer surface of the suction portion has an inclined surface that decreases in diameter towards the tip.

4. The hole cleaning device according to claim 1, characterized in that the outer diameter of the sliding contact member decreases from the middle portion toward the tip and base ends.

5. A method for cleaning a hole into which a reinforcing member for reinforcing an existing concrete structure is inserted, using the hole cleaning device described in claim 1, The steps include inserting the hole cleaning device into the hole from the suction side, The process involves inserting the hole cleaning device toward the bottom of the hole while suction is being drawn into the hole through the suction unit and the suction hose, A method for cleaning a hole, characterized by comprising the steps of stopping the suction inside the hole and withdrawing the hole cleaning device from the hole.

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